Secure the value in web.config "ConnectRestReturnAccesskey"

Based on experience from  SERVICE-238  it is essential that in the MM web.config file, the value in the string below is correct:

<add key="ConnectRestReturnAccesskey" value="false" />

The value must be set to "true" else customers risk getting error: 

"401 - Unauthorized: Access is denied due to invalid credentials.
You do not have permission to view this directory or page using the credentials that you supplied"

the first time they want to download an asset from MM.

web.config:

The customer error message: